This paper summarises a number of research studies on the torsion and buckling behaviour of beams which derive from a theory developed by Wagner, who extended Timoshenko 's treatment of the elastic buckling of I-section beams and columns to members of general thin-walled open cross-section. These studies include applications of the first-order Wagner theory to the buckling of beams and cantilevers, and of the second-order Wagner theory to the large rotations and post-buckling behaviour of beams. Authored by N S Trahair, University of Sydney School of Civil Engineering Research Report R916, March 2011. http://sydney.edu.au/engineering/civil/publications/index.shtml
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